Dropdown in panel header does not inherit its colors

Fix for issue #10627

dist/css/bootstrap.css

@@ -5491,6 +5491,10 @@ a.list-group-item:focus {
   border-top-left-radius: 3px;
 }
 
+.panel-heading > .dropdown .dropdown-toggle {
+  color: inherit;
+}
+
 .panel-title {
   margin-top: 0;
   margin-bottom: 0;
@@ -5549,6 +5553,10 @@ a.list-group-item:focus {
   border-top-color: #dddddd;
 }
 
+.panel-default > .panel-heading > .dropdown .caret {
+  border-color: #333333 transparent;
+}
+
 .panel-default > .panel-footer + .panel-collapse .panel-body {
   border-bottom-color: #dddddd;
 }
@@ -5567,6 +5575,10 @@ a.list-group-item:focus {
   border-top-color: #428bca;
 }
 
+.panel-primary > .panel-heading > .dropdown .caret {
+  border-color: #ffffff transparent;
+}
+
 .panel-primary > .panel-footer + .panel-collapse .panel-body {
   border-bottom-color: #428bca;
 }
@@ -5585,6 +5597,10 @@ a.list-group-item:focus {
   border-top-color: #d6e9c6;
 }
 
+.panel-success > .panel-heading > .dropdown .caret {
+  border-color: #468847 transparent;
+}
+
 .panel-success > .panel-footer + .panel-collapse .panel-body {
   border-bottom-color: #d6e9c6;
 }
@@ -5603,6 +5619,10 @@ a.list-group-item:focus {
   border-top-color: #fbeed5;
 }
 
+.panel-warning > .panel-heading > .dropdown .caret {
+  border-color: #c09853 transparent;
+}
+
 .panel-warning > .panel-footer + .panel-collapse .panel-body {
   border-bottom-color: #fbeed5;
 }
@@ -5621,6 +5641,10 @@ a.list-group-item:focus {
   border-top-color: #eed3d7;
 }
 
+.panel-danger > .panel-heading > .dropdown .caret {
+  border-color: #b94a48 transparent;
+}
+
 .panel-danger > .panel-footer + .panel-collapse .panel-body {
   border-bottom-color: #eed3d7;
 }
@@ -5639,6 +5663,10 @@ a.list-group-item:focus {
   border-top-color: #bce8f1;
 }
 
+.panel-info > .panel-heading > .dropdown .caret {
+  border-color: #3a87ad transparent;
+}
+
 .panel-info > .panel-footer + .panel-collapse .panel-body {
   border-bottom-color: #bce8f1;
 }

less/mixins.less

@@ -396,6 +396,9 @@
     + .panel-collapse .panel-body {
       border-top-color: @border;
     }
+    & > .dropdown .caret {
+      border-color: @heading-text-color transparent;
+    }
   }
   & > .panel-footer {
     + .panel-collapse .panel-body {

less/panels.less

@@ -92,6 +92,9 @@
   padding: 10px 15px;
   border-bottom: 1px solid transparent;
   .border-top-radius(@panel-border-radius - 1);
+  & > .dropdown .dropdown-toggle {
+    color: inherit;
+  }
 }
 
 // Within heading, strip any `h*` tag of it's default margins for spacing.